Add devcontainer starter doc

appendix-A/04_optional-docker-environment/README.md

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+# Docker Environment Setup Guide
+
+The notebooks can be run and developed in a docker container without the need to install any software packages on your local machine. This guide will walk you through that process.
+
+
+## Download and install Docker
+
+The easiest way to get started with docker is by installing [Docker Desktop](https://docs.docker.com/desktop/) for your relevant platform.
+
+Linux (Ubuntu) users may prefer to install the [Docker Engine](https://docs.docker.com/engine/install/ubuntu/) instead and follow the [post installation](https://docs.docker.com/engine/install/linux-postinstall/) steps.
+
+
+## Install VSCode
+
+Whilst devcontainers work with other IDEs as well, I prefer to use Visual Studio Code. [Install](https://code.visualstudio.com/download) it if you don't have it and want to use it. The instructions below will be VSCode specific but a similar process should apply to PyCharm as well.
+
+1. Clone and `cd` into the project root directory.
+2. Type `code .` in the terminal to open the project in VSCode. Alternatively, you can launch VSCode and select the project to open from the UI.
+3. Install the **Remote Development** extension from the Extensions tab.
+4. Since the `.devcontainer` folder is present, VSCode should automatically detect it and ask whether you would like to open the project in a devcontainer. If it doesn't, simply press `Ctrl + Shift + P` to open the command palette and start typing `dev containers` to see a list of all Dev Container specific options.
+5. Select **Reopen in Container**.
+6. Once the image has been pulled and built, you should have your project mounted inside the container with all the packages installed, ready for development.